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This is not marked but is has all the looks of George Nelson for Herman Miller. I have no leaves. It is a fairly simple walnut so it doesn't seem it would be too difficult to have leaves made for it, or use a tablecloth. Table is in very good condition. One of the wooden hinges has a broken / missing piece. The damage is not visible when the leaf is lifted in place. One corner has chipped veneer as shown. One of the bottom flat supports also has a piece of broken veneer, and a portion of the veneer will need to be glued down. It is a very convenient 18 inches across when folded.
Finish has a little wear but aside from the chipped corner and scuffed edges it is not in need of refinishing.
I have a number of Danish / Mid Century modern pieces listed if you want to look at the " more ads by this seller" link in this listing.
Table is located in Northern RI. I'm about 20 minutes from Providence and a little over an hour from Hartford or Boston.